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Wired client workgroup9/20/2023 ![]() The Security tab on the Wireless Network Properties dialog (see Figure 1) and Authentication tab on the Local Area Connection Properties dialog (see Figure 2) now have an Advanced Settings button. However, now they’ve moved most of those settings to the GUI in Windows 7. Microsoft introduced advanced settings for 802.1X in the Group Policy settings of Windows Vista. ![]() Utilizing the new 802.1X settings in Windows 7 Therefore, you should mark the Do not prompt user to authorize new servers or trusted certification authorities option to automatically reject these “unknown” servers. This might be fine for administrators, but regular users might be confused and unknowingly accept a connection to a phony server and network. Normally, users are prompted to accept or reject authentication servers that aren’t using a CA you specify or aren’t from an address you’ve inputted. Third, prevent users from accepting new or untrusted servers. Mark the second checkbox, Connect to these servers, and enter the domain(s) separating each server name with a semicolon. Second, specify the addresses for the network’s authentication server(s), so the client will only communicate with those listed. However, if you created your own self-signed certificate for the authentication server, you have to import the CA certificate into the Trusted Root Certification Authorities store of Windows. If you purchased an SSL certificate, Windows should have the CA loaded already. Then select the Certificate Authority (CA) that the server’s certificate uses from the list box. To do this, mark the first checkbox, Validate server certificate. For a wired network, go to the network connection properties, select the Authentication tab (see Figure 2, below), and click the Settings button for the desired authentication method.įigure 3 (below) shows an example of the PEAP settings.įirst, make sure the client authenticates the server before letting the server authenticate it. To bring these up for a wireless network, open its profile or properties dialog, select the Security tab (see Figure 1, above), and click the Settings button for the desired authentication method. The settings we’re going to talk about are the main Smart Card, Certificate, or PEAP settings. However, there are a few features that you can take advantage of to help prevent this type of attack. If the client’s 802.1X settings for the server-side of the authentication are lenient, the client could potentially “trust” the bogus authentication server. One potential way for a hacker to capture a client’s network credentials and/or access to the client is to pose as an authentication server. Plus we’ll review two other tips: enabling 802.1X for wired networks and removing cached login credentials. Then we’ll review the new advanced settings for 802.1X in Windows 7. In this tutorial, we’ll first see how to securely set the 802.1X settings to prevent man-in-the-middle attacks. On each client, you must configure the smart card, certificate, or PEAP settings, usually in addition to settings for IPsec or WPA/WP2 encryption. Does your network use the 802.1X port-based access method for authentication on the wired and/or wireless side? If so, you know it takes a bit more than just plugging into an Ethernet port or entering an encryption key to connect to the network.
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